By default jobs are discarded after the time specified in knime-server.config. In case you want to discard jobs of specific workflows earlier than the time specified in knime-server.config you can do this via the server’s REST API. You can extract all jobs created from a specific workflow (GET /rest/v4/repository/{path}:jobs) and check their execution end time. Based on that you can perform DELETE requests for all jobs that are “outdated” (DELETE /rest/v4/jobs/{uuid}).